If you want to put a switch on, why not figure out the wiring going to the actual transfer case, instead of the fuse box? There must be powere supplied to some actuator that does teh actual engagement., Cut the power to that, and it should diable the FWD, without all the other issues (unless that due to diagnostics triggerering all the other stuff, like wipers). Haven't looked into this at all ... just off the top of my head

If you want to put a switch on, why not figure out the wiring going to the actual transfer case, instead of the fuse box? There must be powere supplied to some actuator that does teh actual engagement., Cut the power to that, and it should diable the FWD, without all the other issues (unless that due to diagnostics triggerering all the other stuff, like wipers). Haven't looked into this at all ... just off the top of my head

I doubt that would work.....you would need to disable EBD, at the least, as well.

There was a popular mod (it was popular for about a week) where people were modifying their light switch to allow the already wired rear fogs to work. The "blank" located on the light switch was turned into a switch (although it did not light up) and people were now able to use the rear fogs not intended for the U.S.

Let's do that "mod" but with one of the buttons on the lower console (see pic) for this AWD to RWD switch. I'm not sure it the buttons will work the same as the fog light mod but it does give us a great location since this spot is not used. Also, I want someone to set it up so that it's on a relay system so it resets back to normal when the car is turned off.

Although I admit I have not read this entire thread, I'd like to add this bit of info. My situation is different in that currently my xdive system is not working (I think it's the transfer case servo motor that is toast on mine, BT error says something like transfer case - clutch position unknown). Anyway, I've been driving aorund in 2wd for about 6 months. ABS, DSC, cruise, and 4x4 don't work. Everything else works fine (wipers, brake lights, speedo, odo, etc.). I've got a few codes thrown. Those codes can be cleared using Bav Tech. If someone is really adventurous, you could splice into transfer case wiring that goes to the servo motor and put your switch in there. Not advocating that at all, but just thought I'd throw that out there. Not sure what that would do about errors, etc., but my xdrive hasn't worked for months but everything else (other than Christmas tree error lights) is fine. Just Fyi.

Although I admit I have not read this entire thread, I'd like to add this bit of info. My situation is different in that currently my xdive system is not working (I think it's the transfer case servo motor that is toast on mine, BT error says something like transfer case - clutch position unknown). Anyway, I've been driving aorund in 2wd for about 6 months. ABS, DSC, cruise, and 4x4 don't work. Everything else works fine (wipers, brake lights, speedo, odo, etc.). I've got a few codes thrown. Those codes can be cleared using Bav Tech. If someone is really adventurous, you could splice into transfer case wiring that goes to the servo motor and put your switch in there. Not advocating that at all, but just thought I'd throw that out there. Not sure what that would do about errors, etc., but my xdrive hasn't worked for months but everything else (other than Christmas tree error lights) is fine. Just Fyi.

I have a feeling that you can't just do that. You'll probably need to reinitialize the motor or something.

And I wouldn't keep clearing those codes. Your car needs to know there's something wrong all the time. If you clear them, your car will try to operate normally at start up. Those codes are thrown because something is wrong and without theses codes your car may try to activate other components related to the faulty system and could damage them aswell.

There was a popular mod (it was popular for about a week) where people were modifying their light switch to allow the already wired rear fogs to work. The "blank" located on the light switch was turned into a switch (although it did not light up) and people were now able to use the rear fogs not intended for the U.S.

Let's do that "mod" but with one of the buttons on the lower console (see pic) for this AWD to RWD switch. I'm not sure it the buttons will work the same as the fog light mod but it does give us a great location since this spot is not used. Also, I want someone to set it up so that it's on a relay system so it resets back to normal when the car is turned off.

Here's what I think. Install a switch, as others have suggested, to turn off the transfer case, one wire, probably a 12volt lead. Then the TC will get signals but will not be able to engage. The car will be a 2wd car with all the other traction control stuff working. Turn off the DTC, as we all know how to do. Voila!

All that pulling fuses talk is like turning off the main breaker of your house to turn off the tv.